Day 6:
I did a 100% water change. No more medication in the water.
He's swimming about much more but still not to his pre-illness levels. He also tires easily.
My major concern right now is that he's still not eating... It's been a week since he has. If he doesn't start eating soon I'm worried he'll starve.
Well, fingers crossed! The metronidazole in the water is really the only way to treat internal protozoans on a fish that isn't eating. Worm parasites typically don't cause a fish to stop eating. Bacterial enteritis and coccidia are also possibilities, but the latter can't really be treated. for.
Jay